August 2025
Nothing to hack, nothing to leak
Bought it for a stockroom till point. No Wi-Fi, no app, no account. At the end of the week the card comes out and goes in the safe.
- Recording
- 1080p Full HD, H.264, 30 fps
- Connectivity
- None - no Wi-Fi, Bluetooth or cellular radio, and nothing is uploaded to the cloud
- Storage
- microSD up to 128 GB, loop recording
- Cover
- Fully working scientific calculator
No Wi-Fi Discreet Recording Units In stock
Preventive Calc Desk Security Calculator
Model PV-CAL1 82 reviews
$109.99 per unit · volume pricing applies at 5 and 20 units
A working scientific calculator with a 1080p recorder inside. No Wi-Fi and no cellular, and nothing is uploaded to the cloud - footage never leaves the SD card.
Volume pricing
| 1–4 units | $109.99 / unit | standard |
|---|---|---|
| 5–19 units | $104.49 / unit | save 5% |
| 20+ units | $96.79 / unit | save 12% |
Tiers apply automatically per line in the quote cart. Larger orders are quoted individually.
Lawful use only
This unit is sold for one purpose only: lawful, discreet recording on property you own or control. It has no network connection of any kind - no Wi-Fi, Bluetooth or cellular radio - so it cannot stream, cannot be viewed remotely and cannot upload anything; footage stays on the microSD card inside it, and nothing ever reaches a cloud service. It is not a baby monitor, not a pet camera and not a remote-viewing device, and it will not work as one. Recording people without their consent, or anywhere they have a reasonable expectation of privacy such as bathrooms, changing rooms or bedrooms, is illegal in most jurisdictions, including under US state wiretap and privacy statutes.
Overview
A real scientific calculator that adds, divides and does trigonometry like any other, with a 1080p recorder built into the case. There is no radio of any kind inside: no Wi-Fi, no Bluetooth and no cellular modem, so nothing can be streamed, watched remotely or uploaded. The only way footage ever leaves the unit is if you take the microSD card out and read it on a computer. Nothing is ever uploaded to a cloud service, so the recordings stay completely private and secure. The rear cover folds back so it stands upright on a desk, counter or shelf, and motion detection starts recording on its own when someone walks into frame. It exists for one purpose - discreet local recording on property you own or control.
Key features
- Recording: 1080p Full HD, H.264, 30 fps
- Connectivity: None - no Wi-Fi, Bluetooth or cellular radio, and nothing is uploaded to the cloud
- Storage: microSD up to 128 GB, loop recording
- Cover: Fully working scientific calculator
Specifications
| Model | PV-CAL1 |
|---|---|
| Sensor | 1/4" CMOS, 2 MP |
| Video | 1920 x 1080 @ 30 fps, H.264 MP4 |
| Lens | 3.6 mm pinhole, 78° field of view |
| Night vision | 940 nm IR, 5 m, invisible to the eye |
| Connectivity | None - no Wi-Fi, Bluetooth or cellular radio; nothing is uploaded to the cloud |
| Remote viewing | Not possible by design; footage is read from the card |
| Storage | microSD up to 128 GB (card not included), loop recording |
| Recording modes | Continuous, or motion-triggered |
| Power | 2 x AAA batteries, roughly 8 h of continuous recording |
| Card access | Slot under the battery cover |
| Stand | Rear cover folds back; stands upright on a desk or shelf |
| Status | Visible record LED above the display |
| Dimensions | 147 x 80 x 21 mm, 138 g |
In the box
- Calculator recorder
- 2 x AAA batteries
- Quick start guide
Customer reviews
March 2026
Works as a calculator, which is the point
It sits on the counter and nobody looks twice. The maths functions are real and the display is a proper LCD.
September 2026
Motion mode caught the delivery
It picked up a driver going through our storeroom. Footage was on the card, no cloud involved. Battery lasts about a week on motion mode.
Questions about this product
Still unsure? Ask usWhy do you ask for a lawful-use confirmation?
Because in most jurisdictions the device is legal to own but the use must be lawful. The confirmation is a record that you read the policy; it goes into the quote email.
Do these units have a visible indicator?
Yes. Every unit has a status LED that stays lit while it records. We deliberately do not sell units with the LED disabled, or units disguised as everyday objects.
How long does the battery last?
Per unit in the spec table, typically a full day of recording on a single charge. All units can be powered continuously for 24/7 use.
Do these units need Wi-Fi or an app?
Most do not: the card-based recorders have no radio at all, so there is nothing to pair, no account to create and no way for anyone to reach the footage over a network. Models that do support Wi-Fi say so in their specification table, and every unit records to local storage first regardless.
Can someone tell the camera is there?
The units are compact but not hidden: the LED and the recording duration are visible up close. That is the point of the legal-use policy.
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